Method and device for allocating sl harq feedback report resource in nr v2x

ABSTRACT

A method for performing wireless communication by a first device includes: receiving, from a base station, downlink control information (DCI) for scheduling a sidelink (SL) resource, the DCI including information related to time between a physical sidelink feedback channel (PSFCH) resource and a physical uplink control channel (PUCCH) resource and information related to the PUCCH resource; transmitting, to a second device, a plurality of physical sidelink control channels (PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs) based on the DCI; determining a plurality of PSFCH resources based on an index of a slot and a sub channel related to the plurality of PSSCHs and a source ID of the first device; receiving a plurality of pieces of SL HARQ feedback related to the plurality of PSSCHs; and transmitting, to the base station, one piece of SL hybrid automatic repeat request (HARQ) feedback on one PUCCH resource.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119(e), this application is a continuation ofInternational Application PCT/KR2020/010825, with an internationalfiling date of Aug. 14, 2020, which claims the benefit of U.S.Provisional Patent Application No. 62/887,489, filed on Aug. 15, 2019,the contents of which are hereby incorporated by reference herein intheir entirety.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic.

Vehicle-to-everything (V2X) refers to a communication technology throughwhich a vehicle exchanges information with another vehicle, apedestrian, an object having an infrastructure (or infra) establishedtherein, and so on. The V2X may be divided into 4 types, such asvehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as Basic Safety Message (BSM), CooperativeAwareness Message (CAM), and Decentralized Environmental NotificationMessage (DENM) is focused in the discussion on the RAT used before theNR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

For example, the CAM may include dynamic state information of thevehicle such as direction and speed, static data of the vehicle such asa size, and basic vehicle information such as an exterior illuminationstate, route details, or the like. For example, the UE may broadcast theCAM, and latency of the CAM may be less than 100 ms. For example, the UEmay generate the DENM and transmit it to another UE in an unexpectedsituation such as a vehicle breakdown, accident, or the like. Forexample, all vehicles within a transmission range of the UE may receivethe CAM and/or the DENM. In this case, the DENM may have a higherpriority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

For example, based on the vehicle platooning, vehicles may move togetherby dynamically forming a group. For example, in order to perform platoonoperations based on the vehicle platooning, the vehicles belonging tothe group may receive periodic data from a leading vehicle. For example,the vehicles belonging to the group may decrease or increase an intervalbetween the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may besemi-automated or fully automated. For example, each vehicle may adjusttrajectories or maneuvers, based on data obtained from a local sensor ofa proximity vehicle and/or a proximity logical entity. In addition, forexample, each vehicle may share driving intention with proximityvehicles.

For example, based on the extended sensors, raw data, processed data, orlive video data obtained through the local sensors may be exchangedbetween a vehicle, a logical entity, a UE of pedestrians, and/or a V2Xapplication server. Therefore, for example, the vehicle may recognize amore improved environment than an environment in which a self-sensor isused for detection.

For example, based on the remote driving, for a person who cannot driveor a remote vehicle in a dangerous environment, a remote driver or a V2Xapplication may operate or control the remote vehicle. For example, if aroute is predictable such as public transportation, cloud computingbased driving may be used for the operation or control of the remotevehicle. In addition, for example, an access for a cloud-based back-endservice platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2Xscenarios such as vehicle platooning, advanced driving, extendedsensors, remote driving, or the like is discussed in NR-based V2Xcommunication.

SUMMARY OF THE DISCLOSURE Technical Objects

Meanwhile, in the case of LTE sidelink mode 1 or mode 3 operation, or inthe case of NR sidelink mode 1 operation in which a base stationallocates sidelink transmission resource(s) to UE(s), it may benecessary for a transmitting UE to report information on received HARQfeedback, in order for the base station to efficiently manage sidelinkresource(s). In addition, as described above, the transmitting UE maytransmit information on SL HARQ feedback corresponding to the PSSCHand/or the PSCCH transmitted to the receiving UE to the base stationthrough the PUCCH. Therefore, there is a need to propose a method inwhich the base station efficiently allocates resource(s) for PUCCHtransmission for SL HARQ feedback report to the transmitting UE.

Technical Solutions

In one embodiment, a method for performing wireless communication by afirst device is provided. The method may comprise: receiving, from abase station through a physical downlink control channel (PDCCH), adownlink control information (DCI) for scheduling sidelink (SL)resources, wherein the DCI includes information related to a timebetween a physical sidelink feedback channel (PSFCH) resource and aphysical uplink control channel (PUCCH) resource and information relatedto the PUCCH resource; transmitting, to a second device, a plurality ofphysical sidelink control channels (PSCCHs) and a plurality of physicalsidelink shared channels (PSSCHs), based on the DCI; determining aplurality of PSFCH resources, based on indices of slots related to theplurality of PSSCHs, indices of subchannels related to the plurality ofPSSCHs, and a source ID of the first device; receiving, from the seconddevice, a plurality of SL hybrid automatic repeat request (HARQ)feedbacks related to the plurality of PSSCHs on the plurality of PSFCHresources; and transmitting, to the base station, one SL HARQ feedbackon one PUCCH resource, based on the information related to the time andthe information related to the PUCCH resource, wherein the one PUCCHresource is allocated after a last PSFCH resource among the plurality ofPSFCH resources.

In one embodiment, a first device configured to perform wirelesscommunication is provided. The first device may comprise: one or morememories storing instructions; one or more transceivers; and one or moreprocessors connected to the one or more memories and the one or moretransceivers. For example, the one or more processors may execute theinstructions to: receive, from a base station through a physicaldownlink control channel (PDCCH), a downlink control information (DCI)for scheduling sidelink (SL) resources, wherein the DCI includesinformation related to a time between a physical sidelink feedbackchannel (PSFCH) resource and a physical uplink control channel (PUCCH)resource and information related to the PUCCH resource; transmit, to asecond device, a plurality of physical sidelink control channels(PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs),based on the DCI; determining a plurality of PSFCH resources, based onindices of slots related to the plurality of PSSCHs, indices ofsubchannels related to the plurality of PSSCHs, and a source ID of thefirst device; receive, from the second device, a plurality of SL hybridautomatic repeat request (HARQ) feedbacks related to the plurality ofPSSCHs on the plurality of PSFCH resources; and transmit, to the basestation, one SL HARQ feedback on one PUCCH resource, based on theinformation related to the time and the information related to the PUCCHresource, wherein the one PUCCH resource is allocated after a last PSFCHresource among the plurality of PSFCH resources.

Effects of the Disclosure

The user equipment (UE) may efficiently perform SL communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, based onan embodiment of the present disclosure.

FIG. 4 shows a radio protocol architecture, based on an embodiment ofthe present disclosure.

FIG. 5 shows a structure of an NR system, based on an embodiment of thepresent disclosure.

FIG. 6 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure.

FIG. 7 shows an example of a BWP, based on an embodiment of the presentdisclosure.

FIG. 8 shows a radio protocol architecture for a SL communication, basedon an embodiment of the present disclosure.

FIG. 9 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure.

FIG. 10 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure.

FIG. 11 shows three cast types, based on an embodiment of the presentdisclosure.

FIG. 12 shows a procedure for a transmitting UE to report information onSL HARQ feedback to a base station, based on an embodiment of thepresent disclosure.

FIG. 13 shows an example of resource allocation based on an embodimentof the present disclosure.

FIG. 14 shows an example of PUCCH resource allocation based on a symbolunit offset, based on an embodiment of the present disclosure.

FIG. 15 shows an example of PUCCH resource allocation based on a slotunit offset, based on an embodiment of the present disclosure.

FIG. 16 shows a procedure for a transmitting UE to report information onSL HARQ feedback to a base station, based on an embodiment of thepresent disclosure.

FIG. 17 shows an example of resource allocation based on an embodimentof the present disclosure.

FIG. 18 shows a method for a first device to report information on SLHARQ feedback to a second device, based on an embodiment of the presentdisclosure.

FIG. 19 shows a method for a second device to receive information on SLHARQ feedback from a first device, based on an embodiment of the presentdisclosure.

FIG. 20 shows a method for a first device to perform wirelesscommunication, based on an embodiment of the present disclosure.

FIG. 21 shows a method for a base station to perform wirelesscommunication, based on an embodiment of the present disclosure.

FIG. 22 shows a communication system 1, based on an embodiment of thepresent disclosure.

FIG. 23 shows wireless devices, based on an embodiment of the presentdisclosure.

FIG. 24 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

FIG. 25 shows another example of a wireless device, based on anembodiment of the present disclosure.

FIG. 26 shows a hand-held device, based on an embodiment of the presentdisclosure.

FIG. 27 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present disclosure, “A or B” may mean “only A”, “only B” or “bothA and B.” In other words, in the present disclosure, “A or B” may beinterpreted as “A and/or B”. For example, in the present disclosure, “A,B, or C” may mean “only A”, “only B”, “only C”, or “any combination ofA, B, C”.

A slash (/) or comma used in the present disclosure may mean “and/or”.For example, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean“only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean“A, B, or C”.

In the present disclosure, “at least one of A and B” may mean “only A”,“only B”, or “both A and B”. In addition, in the present disclosure, theexpression “at least one of A or B” or “at least one of A and/or B” maybe interpreted as “at least one of A and B”.

In addition, in the present disclosure, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present disclosure may mean “forexample”. Specifically, when indicated as “control information (PDCCH)”,it may mean that “PDCCH” is proposed as an example of the “controlinformation”. In other words, the “control information” of the presentdisclosure is not limited to “PDCCH”, and “PDCCH” may be proposed as anexample of the “control information”. In addition, when indicated as“control information (i.e., PDCCH)”, it may also mean that “PDCCH” isproposed as an example of the “control information”.

A technical feature described individually in one figure in the presentdisclosure may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure. The embodiment of FIG. 2 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 2, a next generation-radio access network (NG-RAN) mayinclude a BS 20 providing a UE 10 with a user plane and control planeprotocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, based onan embodiment of the present disclosure. The embodiment of FIG. 3 may becombined with various embodiments of the present disclosure.

Referring to FIG. 3, the gNB may provide functions, such as Inter CellRadio Resource Management (RRM), Radio Bearer (RB) control, ConnectionMobility Control, Radio Admission Control, Measurement Configuration &Provision, Dynamic Resource Allocation, and so on. An AMF may providefunctions, such as Non Access Stratum (NAS) security, idle statemobility processing, and so on. A UPF may provide functions, such asMobility Anchoring, Protocol Data Unit (PDU) processing, and so on. ASession Management Function (SMF) may provide functions, such as userequipment (UE) Internet Protocol (IP) address allocation, PDU sessioncontrol, and so on.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (L1), a second layer (L2), and a thirdlayer (L3) based on the lower three layers of the open systeminterconnection (OSI) model that is well-known in the communicationsystem. Among them, a physical (PHY) layer belonging to the first layerprovides an information transfer service by using a physical channel,and a radio resource control (RRC) layer belonging to the third layerserves to control a radio resource between the UE and the network. Forthis, the RRC layer exchanges an RRC message between the UE and the BS.

FIG. 4 shows a radio protocol architecture, based on an embodiment ofthe present disclosure. The embodiment of FIG. 4 may be combined withvarious embodiments of the present disclosure. Specifically, FIG. 4(a)shows a radio protocol architecture for a user plane, and FIG. 4(b)shows a radio protocol architecture for a control plane. The user planecorresponds to a protocol stack for user data transmission, and thecontrol plane corresponds to a protocol stack for control signaltransmission.

Referring to FIG. 4, a physical layer provides an upper layer with aninformation transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., the MAC layer, the RLC layer, and thepacket data convergence protocol (PDCP) layer) for data delivery betweenthe UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

The physical channel includes several OFDM symbols in a time domain andseveral sub-carriers in a frequency domain. One sub-frame includes aplurality of OFDM symbols in the time domain. A resource block is a unitof resource allocation, and consists of a plurality of OFDM symbols anda plurality of sub-carriers. Further, each subframe may use specificsub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of acorresponding subframe for a physical downlink control channel (PDCCH),i.e., an L1/L2 control channel. A transmission time interval (TTI) is aunit time of subframe transmission.

FIG. 5 shows a structure of an NR system, based on an embodiment of thepresent disclosure. The embodiment of FIG. 5 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 5, in the NR, a radio frame may be used for performinguplink and downlink transmission. A radio frame has a length of 10 msand may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined based on subcarrier spacing (SCS). Each slotmay include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(subfsame,u) _(slot)) based on anSCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N_(symb) ^(slot) N_(slot) ^(frame, u) N_(slot)^(subframe, u)  15 KHz (u = 0) 14  10  1  30 KHz (u = 1) 14  20  2  60KHz (u = 2) 14  40  4 120 KHz (u = 3) 14  80  8 240 KHz (u = 4) 14 16016

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe based on the SCS, ina case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N_(symb) ^(slot) N_(slot) ^(frame, u) N_(slot)^(subframe, u) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table 3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 6 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure. The embodiment of FIG. 6 may becombined with various embodiments of the present disclosure.

Referring to FIG. 6, a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Meanwhile, a radio interface between a UE and another UE or a radiointerface between the UE and a network may consist of an L1 layer, an L2layer, and an L3 layer. In various embodiments of the presentdisclosure, the L1 layer may imply a physical layer. In addition, forexample, the L2 layer may imply at least one of a MAC layer, an RLClayer, a PDCP layer, and an SDAP layer. In addition, for example, the L3layer may imply an RRC layer.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier.

When using bandwidth adaptation (BA), a reception bandwidth andtransmission bandwidth of a UE are not necessarily as large as abandwidth of a cell, and the reception bandwidth and transmissionbandwidth of the BS may be adjusted. For example, a network/BS mayinform the UE of bandwidth adjustment. For example, the UE receiveinformation/configuration for bandwidth adjustment from the network/BS.In this case, the UE may perform bandwidth adjustment based on thereceived information/configuration. For example, the bandwidthadjustment may include an increase/decrease of the bandwidth, a positionchange of the bandwidth, or a change in subcarrier spacing of thebandwidth.

For example, the bandwidth may be decreased during a period in whichactivity is low to save power. For example, the position of thebandwidth may move in a frequency domain. For example, the position ofthe bandwidth may move in the frequency domain to increase schedulingflexibility. For example, the subcarrier spacing of the bandwidth may bechanged. For example, the subcarrier spacing of the bandwidth may bechanged to allow a different service. A subset of a total cell bandwidthof a cell may be called a bandwidth part (BWP). The BA may be performedwhen the BS/network configures the BWP to the UE and the BS/networkinforms the UE of the BWP currently in an active state among theconfigured BWPs.

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH,physical downlink shared channel (PDSCH), or channel stateinformation-reference signal (CSI-RS) (excluding RRM) outside the activeDL BWP. For example, the UE may not trigger a channel state information(CSI) report for the inactive DL BWP. For example, the UE may nottransmit physical uplink control channel (PUCCH) or physical uplinkshared channel (PUSCH) outside an active UL BWP. For example, in adownlink case, the initial BWP may be given as a consecutive RB set fora remaining minimum system information (RMSI) control resource set(CORESET) (configured by physical broadcast channel (PBCH)). Forexample, in an uplink case, the initial BWP may be given by systeminformation block (SIB) for a random access procedure. For example, thedefault BWP may be configured by a higher layer. For example, an initialvalue of the default BWP may be an initial DL BWP. For energy saving, ifthe UE fails to detect downlink control information (DCI) during aspecific period, the UE may switch the active BWP of the UE to thedefault BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmita SL channel or a SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. The SL BWP may be (pre-)configured in a carrier withrespect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UEin the RRC_CONNECTED mode, at least one SL BWP may be activated in thecarrier.

FIG. 7 shows an example of a BWP, based on an embodiment of the presentdisclosure. The embodiment of FIG. 7 may be combined with variousembodiments of the present disclosure. It is assumed in the embodimentof FIG. 7 that the number of BWPs is 3.

Referring to FIG. 7, a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

FIG. 8 shows a radio protocol architecture for a SL communication, basedon an embodiment of the present disclosure. The embodiment of FIG. 8 maybe combined with various embodiments of the present disclosure. Morespecifically, FIG. 8(a) shows a user plane protocol stack, and FIG. 8(b)shows a control plane protocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) andsynchronization information will be described.

The SLSS may include a primary sidelink synchronization signal (PSSS)and a secondary sidelink synchronization signal (SSSS), as a SL-specificsequence. The PSSS may be referred to as a sidelink primarysynchronization signal (S-PSS), and the SSSS may be referred to as asidelink secondary synchronization signal (S-SSS). For example,length-127 M-sequences may be used for the S-PSS, and length-127 goldsequences may be used for the S-SSS. For example, a UE may use the S-PSSfor initial signal detection and for synchronization acquisition. Forexample, the UE may use the S-PSS and the S-SSS for acquisition ofdetailed synchronization and for detection of a synchronization signalID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit cyclic redundancy check (CRC).

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 9 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure. The embodiment of FIG. 9 may becombined with various embodiments of the present disclosure.

Referring to FIG. 9, in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit a SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIG. 10 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure. The embodiment of FIG. 10 may be combined with variousembodiments of the present disclosure. In various embodiments of thepresent disclosure, the transmission mode may be called a mode or aresource allocation mode. Hereinafter, for convenience of explanation,in LTE, the transmission mode may be called an LTE transmission mode. InNR, the transmission mode may be called an NR resource allocation mode.

For example, FIG. 10(a) shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, FIG. 10(a) shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, FIG. 10(b) shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, FIG. 10(b) shows a UE operation related to an NR resourceallocation mode 2.

Referring to FIG. 10(a), in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule a SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (more specifically, downlink control information (DCI)), and theUE 1 may perform V2X or SL communication with respect to a UE 2according to the resource scheduling. For example, the UE 1 may transmita sidelink control information (SCI) to the UE 2 through a physicalsidelink control channel (PSCCH), and thereafter transmit data based onthe SCI to the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to FIG. 10(b), in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine a SL transmission resource within a SL resource configured bya BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIG. 11 shows three cast types, based on an embodiment of the presentdisclosure. The embodiment of FIG. 11 may be combined with variousembodiments of the present disclosure. Specifically, FIG. 11(a) showsbroadcast-type SL communication, FIG. 11(b) shows unicast type-SLcommunication, and FIG. 11(c) shows groupcast-type SL communication. Incase of the unicast-type SL communication, a UE may perform one-to-onecommunication with respect to another UE. In case of the groupcast-typeSL transmission, the UE may perform SL communication with respect to oneor more UEs in a group to which the UE belongs. In various embodimentsof the present disclosure, SL groupcast communication may be replacedwith SL multicast communication, SL one-to-many communication, or thelike.

Meanwhile, in NR sidelink, at least from the viewpoint of transmissionof a UE in carrier(s), time division multiplexing (TDM) between aPSCCH/PSSCH and a physical sidelink feedback channel (PSFCH) is allowedfor transmission of PSFCH format for sidelink in slots. In addition, inunicast sidelink communication, hybrid automatic repeat request (HARQ)feedback transmission of UE(s) may be supported. In addition, ingroupcast sidelink communication, HARQ feedback transmission of UE(s)may be supported. That is, in the unicast sidelink communication or thegroupcast sidelink communication, a receiving UE may transmit HARQfeedback corresponding to a PSCCH and/or a PSSCH received from atransmitting UE to the transmitting UE. Furthermore, when HARQ feedbackis enabled for the groupcast sidelink communication, the HARQ feedbackoption 1 or the HARQ feedback option 2 may be supported.

According to the HARQ feedback option 1, a receiving UE may transmitonly HARQ negative acknowledgement (NACK) to a transmitting UE. That is,the receiving UE may not transmit HARQ acknowledgement (ACK) to thetransmitting UE. If the HARQ feedback option 1 is used for sidelinkgroupcast transmission, a plurality of receiving UEs (e.g., allreceiving UEs or some receiving UEs in a group) may share a PSFCHresource to transmit HARQ feedback.

On the other hand, according to the HARQ feedback option 2, a receivingUE may transmit HARQ ACK or HARQ NACK to a transmitting UE. If the HARQfeedback option 2 is used for sidelink groupcast transmission, aplurality of receiving UEs (e.g., each receiving UEs in a group)transmits HARQ ACK or HARQ NACK by using separate PSFCH resources. Forexample, each of PSFCH resources may be mapped to a time resource, afrequency resource, and a code resource.

In slots associated with a resource pool, PSFCH resources may beperiodically (pre-)configured with a period of N slots. For example, Nmay be a positive integer. For example, N may be 2 or 4.

Meanwhile, in NR sidelink, a sequence-based PSFCH format having onesymbol may be supported. The one symbol does not include an automaticgain control (AGC) training period. The sequence-based PSFCH formathaving the one symbol may be applicable to HARQ feedback in unicast. Inaddition, the sequence-based PSFCH format having one symbol may beapplicable to HARQ feedback in groupcast including the HARQ feedbackoption 1 and the HARQ feedback option 2. The sequence-based PSFCH formatsequence having one symbol may be generated similarly to the sequence ofa PUCCH format 0.

In the case of the HARQ feedback option 1 based on TX-RX distance-basedHARQ feedback for groupcast, if the TX-RX distance is less than or equalto the communication range requirement, a receiving UE may transmit HARQfeedback for a PSSCH. Otherwise, the receiving UE may not transmit HARQfeedback for the PSSCH. For example, the location of the transmitting UEmay be indicated by a SCI related to the PSSCH.

Meanwhile, for PSSCH transmission in the last symbol of slot n, HARQfeedback related to the PSSCH transmission is expected to be in slotn+a. Herein, a may be the smallest integer greater than or equal to Kunder the condition that slot n+a includes PSFCH resource(s). Inaddition, if at least a PSFCH in the slot is a response to a singlePSSCH, the implicit mechanism may be used to determine at least afrequency domain resource and/or a code domain resource of the PSFCHwithin the configured resource pool.

Meanwhile, in case a base station allocates resource(s) for sidelinktransmission to a transmitting UE, if the transmitting UE that hasperformed sidelink transmission through the resource(s) receives HARQfeedback for the sidelink transmission from a receiving UE, thetransmitting UE needs to report information on the HARQ feedback to thebase station.

For example, it is assumed that a base station allocates a first PSSCHand/or a first PSCCH for initial transmission to a transmitting UE andallocates a second PSSCH and/or a second PSCCH for sidelink HARQfeedback-based retransmission to the transmitting UE. In this case, thetransmitting UE may transmit sidelink information to a receiving UEthrough the first PSSCH and/or the first PSCCH. In the presentdisclosure, the sidelink information may include at least one ofsidelink data, sidelink control information, a sidelink service, or asidelink packet. Thereafter, if the transmitting UE receives HARQ NACKfrom the receiving UE, the transmitting UE may report information onHARQ feedback related to the HARQ NACK to the base station through aPUCCH, and the transmitting UE may retransmit the sidelink informationto the receiving UE through the second PSSCH and/or the second PSCCH.Thereafter, if the transmitting UE receives HARQ NACK from the receivingUE, the transmitting UE may report information on HARQ feedback relatedto the HARQ NACK to the base station through a PUCCH. In this case, thebase station may allocate additional sidelink transmission resource(s)to the transmitting UE.

For example, it is assumed that a base station allocates a first PSSCHand/or a first PSCCH for initial transmission to a transmitting UE andallocates a second PSSCH and/or a second PSCCH for sidelink HARQfeedback-based retransmission to the transmitting UE. In this case, thetransmitting UE may transmit sidelink information to a receiving UEthrough the first PSSCH and/or the first PSCCH. Thereafter, if thetransmitting UE receives HARQ ACK from the receiving UE, thetransmitting UE may report information on HARQ feedback related to theHARQ ACK to the base station through a PUCCH. In this case, it may beunnecessary for the transmitting UE to perform sidelink HARQfeedback-based retransmission through the second PSSCH and/or the secondPSCCH. Accordingly, for example, the base station may allocateresource(s) related to the second PSSCH and/or the second PSCCH toanother UE or may allocate it for uplink transmission of thetransmitting UE.

As described above, in the case of LTE sidelink mode 1 or mode 3operation, or in the case of NR sidelink mode 1 operation in which abase station allocates sidelink transmission resource(s) to UE(s), itmay be necessary for a transmitting UE to report information on receivedHARQ feedback, in order for the base station to efficiently managesidelink resource(s). In addition, as described above, the transmittingUE may transmit information on SL HARQ feedback corresponding to thePSSCH and/or the PSCCH transmitted to the receiving UE to the basestation through the PUCCH. Therefore, there is a need to propose amethod in which the base station efficiently allocates resource(s) forPUCCH transmission for SL HARQ feedback report to the transmitting UE.Hereinafter, based on an embodiment of the present disclosure, a methodfor allocating resource(s) for SL HARQ feedback report and an apparatussupporting the same will be described in detail.

FIG. 12 shows a procedure for a transmitting UE to report information onSL HARQ feedback to a base station, based on an embodiment of thepresent disclosure. The embodiment of FIG. 12 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 12, in step S1210, a base station may transmitinformation on resource(s) related to sidelink transmission to atransmitting UE. For example, the base station may allocate resource(s)related to sidelink transmission to the transmitting UE. For example,the resource(s) related to sidelink transmission may be at least one ofresource(s) for the transmitting UE to transmit sidelink information toa receiving UE and/or resource(s) for the transmitting UE to reportinformation on SL HARQ feedback to the base station. For example, theresource(s) related to sidelink transmission may be at least one ofresource(s) for the transmitting UE to receive SL HARQ feedbackcorresponding to the sidelink information from the receiving UE and/orresource(s) for the receiving UE to transmit SL HARQ feedbackcorresponding to the sidelink information to the transmitting UE. In thepresent disclosure, for convenience of description, a resource for thetransmitting UE to transmit sidelink information may be referred to as asidelink transmission resource, and a resource for the transmitting UEto report information on SL HARQ feedback to the base station may bereferred to as a SL HARQ feedback report resource. For example, thesidelink transmission resource may be resource(s) related totransmission of one or more PSSCHs and/or one or more PSCCHs. Forexample, the SL HARQ feedback report resource may be resource(s) relatedto PUCCH transmission. For example, the SL HARQ feedback report resourcemay be resource(s) related to PUSCH transmission. In the presentdisclosure, for convenience of description, a resource related to PSSCHtransmission may be referred to as a PSSCH resource, and a resourcerelated to PSCCH transmission may be referred to as a PSCCH resource,and a resource related to PUCCH transmission may be referred to as aPUCCH resource, and a resource related to transmission and reception ofSL HARQ feedback may be referred to as a PSFCH resource, and a resourcerelated to PUSCH transmission may be referred to as a PUSCH resource.

Based on an embodiment of the present disclosure, the base station maysignal resource(s) related to sidelink transmission to the transmittingUE through a SL DCI, and/or the base station may configure resource(s)related to sidelink transmission to the transmitting UE through RRCsignaling or a MAC CE. In the present disclosure, the SL DCI may be aDCI for scheduling sidelink transmission-related resources.

For example, the SL DCI may be a sidelink dynamic scheduling DCI. Inthis case, for example, if the transmitting UE intends to transmit a newpacket, the transmitting UE may report SL scheduling request (SR) and/orSL buffer status report (BSR) information to the base station, and thebase station may allocate an initial resource and/or retransmissionresource(s) required for packet transmission based on the SL SR/BSRinformation. For example, if there is data to be transmitted throughsidelink, SL SR may be signaling transmitted by the transmitting UE toinduce sidelink resource allocation by notifying the base station thatdata to be transmitted through sidelink exists. For example, the SL BSRmay be signaling in which the transmitting UE informs the base stationof the amount of sidelink data existed in a buffer to be transmittedthrough the MAC layer in a higher layer.

For example, the SL DCI may be a SL semi-persistent scheduling (SPS)DCI. The SL SPS DCI may be a DCI for activating SL SPS resource(s) or aDCI for releasing SL SPS resource(s). For example, the SL SPSresource(s) may be resource(s) related to a configured grant. In thiscase, for example, the base station may periodically allocate an initialresource and/or retransmission resource(s) necessary for transmitting aplurality of packets, based on UE assistance information reported orpreviously reported by the UE. For example, the UE assistanceinformation may include a period of traffic generated by the UE and/orthe size of traffic generated by the UE.

Hereinafter, a method for a base station to allocate resource(s) relatedto sidelink transmission through a SL DCI, a MAC CE and/or RRC signalingwill be described in detail with reference to the embodiment of FIG. 13.

FIG. 13 shows an example of resource allocation based on an embodimentof the present disclosure. The embodiment of FIG. 13 may be combinedwith various embodiments of the present disclosure.

In the embodiment of FIG. 13, it is assumed that one initialtransmission resource, one or more blind retransmission resources, andtwo SL HARQ feedback-based retransmission resources are allocated to theUE. However, the technical idea of the present disclosure is not limitedthereto, and the number of blind retransmission resources or the numberof SL HARQ feedback-based retransmission resources may be variouslyallocated to the UE. In addition, in the embodiment of FIG. 13, it isassumed that one PSFCH is related to one PSCCH and/or one PSSCH.However, the technical idea of the present disclosure is not limitedthereto, and one PSFCH may be related to one or more PSCCHs and/or oneor more PSSCHs. Furthermore, in the embodiment of FIG. 13, if the SL DCIis the SL SPS DCI, resources for sidelink communication may berepeatedly (periodically) allocated to the UE.

1) Allocation of PSCCH resource(s) and/or PSSCH resource(s)

Referring to FIG. 12, in step S1210, the base station may transmitinformation on one or more PSCCH resources and/or one or more PSSCHresources to the transmitting UE. For example, the base station maytransmit information on a time offset (or a time gap) related to one ormore PSCCH resources and/or one or more PSSCH resources to thetransmitting UE through a SL DCI, a MAC CE and/or RRC signaling. In thiscase, for example, one or more PSCCH resources and/or one or more PSSCHresources may be allocated to the transmitting UE after the time offsetfrom a time when the base station transmits the SL DCI. For example, oneor more PSCCH resources and/or one or more PSSCH resources may beresource(s) for the transmitting UE to perform initial transmission. Forexample, one or more PSCCH resources and/or one or more PSSCH resourcesmay be resource(s) for the transmitting UE to perform initialtransmission and/or blind retransmission. For example, one or more PSCCHresources and/or one or more PSSCH resources may be resource(s) for thetransmitting UE to perform initial transmission and/or SL HARQfeedback-based retransmission. For example, one or more PSCCH resourcesand/or one or more PSSCH resources may be resource(s) for thetransmitting UE to perform initial transmission, blind retransmission,and/or SL HARQ feedback-based retransmission. In the present disclosure,the blind retransmission means that the transmitting UE performsretransmission regardless of HARQ feedback from the receiving UE, andthe SL HARQ feedback-based retransmission means that the transmitting UEperforms retransmission based on HARQ feedback (e.g., HARQ NACK) fromthe receiving UE.

Referring to the embodiment of FIG. 13, the base station may transmitinformation on time offsets T1, T2 and T3 to the transmitting UE througha SL DCI, a MAC CE, and/or RRC signaling. Accordingly, after T1 from atime when the base station transmits the SL DCI, one or more PSCCHresources and/or one or more PSSCH resources for initial transmissionand/or blind retransmission may be allocated to the transmitting UE. Inaddition, after T2 from the time when the base station transmits the SLDCI, one or more PSCCH resources and/or one or more PSSCH resources forSL HARQ feedback-based retransmission may be allocated to thetransmitting UE. In addition, after T3 from the time when the basestation transmits the SL DCI, one or more PSCCH resources and/or one ormore PSSCH resources for SL HARQ feedback-based retransmission may beallocated to the transmitting UE.

2) Allocation of PSFCH resource(s)

Referring to FIG. 12, in step S1210, the base station may transmitinformation on a time offset (or time gap) related to a PSFCH resourcethrough a SL DCI, a MAC CE and/or RRC signaling to the transmitting UEand/or the receiving UE. In this case, for example, the PSFCH resourcemay be allocated to the transmitting UE and/or the receiving UE afterthe time offset from a time when the receiving UE receives a PSCCHand/or a PSSCH.

Alternatively, based on an embodiment of the present disclosure, thetransmitting UE and/or the receiving UE may determine a PSFCH resourcebased on an implicit rule. For example, the receiving UE may determinethe PSFCH resource used to transmit HARQ feedback to the transmittingUE, based on PSCCH and/or PSSCH-related (transmission) parameters (e.g.,PSCCH and/or PSSCH-related slot index, PSCCH and/or PSSCH-relatedsub-channel index, source identity (ID), destination ID, local group ID,etc.).

For example, in case the base station allocates resource(s) related tosidelink transmission to the transmitting UE, the transmitting UE mayreceive PSCCH and/or PSSCH-related (transmission) parameters (e.g.,PSCCH and/or PSSCH-related slot index and PSCCH and/or PSSCH-relatedsub-channel index) from the base station. For example, in case thetransmitting UE autonomously determines or selects resource(s) relatedto sidelink transmission, the transmitting UE may autonomously determinePSCCH and/or PSSCH-related (transmission) parameters (e.g., PSCCH and/orPSSCH-related slot index and PSCCH and/or PSSCH-related sub-channelindex).

For example, the source ID may be an identifier for identifying atransmitting side (e.g., the transmitting UE) of sidelink information insidelink communication. For example, the destination ID may be anidentifier for identifying a receiving side (e.g., the receiving UE) ofsidelink information in sidelink communication. For example, the localgroup ID may be an identifier for identifying a group including UEs ingroupcast sidelink communication. For example, the source ID, thedestination ID, and/or the local group ID may be transmitted through alayer-2 (e.g., MAC layer). For example, the source ID, the destinationID, and/or the local group ID may be provided from a higher layer (e.g.,an application layer) or derived from an ID provided by a higher layer.

3) Allocation of PUCCH resource(s)

Referring to FIG. 12, in step S1210, the base station may transmitinformation on a PUCCH resource to the transmitting UE. For example, thebase station may transmit information on a time offset (or time gap)related to the PUCCH resource to the transmitting UE through a SL DCI, aMAC CE and/or RRC signaling. In this case, for example, a resource(i.e., PUCCH resource) for the transmitting UE to report information onSL HARQ feedback to the base station may be allocated to thetransmitting UE after the time offset from a time when the transmittingUE receives the PSFCH. For example, the PUCCH resource may be allocatedto the transmitting UE after the time offset from a time when the basestation allocates one or more PSCCH resources to the transmitting UE.For example, the PUCCH resource may be allocated to the transmitting UEafter the time offset from a time when the base station allocates one ormore PSSCH resources to the transmitting UE. For example, the PUCCHresource may be allocated to the transmitting UE after the time offsetfrom a time when the base station transmits the SL DCI. In the presentdisclosure, the PUCCH resource may be replaced with a PUSCH resource.

Referring to the embodiment of FIG. 13, the base station may transmitinformation on the time offset (T4, T5, T6, T7, T8 and/or T9) to thetransmitting UE through the SL DCI, the MAC CE and/or the RRC signaling.Accordingly, the PUCCH resource may be allocated to the transmitting UEafter T4 from a time when the transmitting UE receives the PSFCH.Alternatively, for example, the PUCCH resource may be allocated to thetransmitting UE after T6 from a time when the base station allocates oneor more PSCCH resources to the transmitting UE. Alternatively, forexample, the PUCCH resource may be allocated to the transmitting UEafter T5 from a time when the base station allocates one or more PSSCHresources to the transmitting UE. Alternatively, for example, the PUCCHresource may be allocated to the transmitting UE after T7, T8, and T9from a time when the base station transmits the SL DCI. Based on theembodiment of FIG. 13, the time offset is applied from the start symbolof the resource(s). However, the technical idea of the presentdisclosure is not limited thereto. That is, the time offset and areference timing point of the time offset may be defined in variousways. For example, the time offset may be applied from the last symbolof the resource(s). For example, the time offset may be applied from aslot in which the resource(s) is located.

Hereinafter, based on an embodiment of the present disclosure, a PUCCHresource allocation method based on the time offset and the referencetiming point of the time offset will be described in detail.

3.1) PUCCH resource allocation based on symbol unit offset

Based on an embodiment of the present disclosure, the information on thePUCCH resource may include information on a time offset (or symboloffset) from the reference timing point to a symbol related to the PUCCHresource and information on a PUCCH resource index (based on a frequencydomain and/or a code domain) on the symbol or the symbol durationrelated to the PUCCH resource. For example, the reference timing pointmay be at least one of the start symbol of the resource through whichthe SL DCI is transmitted, the last symbol of the resource through whichthe SL DCI is transmitted, the start symbol of the PSSCH resource, thelast symbol of the PSSCH resource, the start symbol of the PSCCHresource, the last symbol of the PSCCH resource, the start symbol of thePSFCH resource, and/or the last symbol of the PSFCH resource. Forexample, the symbol related to the PUCCH resource may be at least one ofthe start symbol of the PUCCH resource and/or the last symbol of thePUCCH resource. For example, the base station may signal the informationon the time offset and the information on the PUCCH resource index tothe transmitting UE through the SL DCI. Alternatively, for example, thebase station may configure the information on the time offset to thetransmitting UE through the MAC CE and/or the RRC signaling, and thebase station may signal the information on the PUCCH resource index tothe transmitting UE through the SL DCI. In this case, payloads of the SLDCI may be reduced. If the transmitting UE receives the information onthe time offset, the transmitting UE may know/determine the symbol orthe symbol duration related to the PUCCH resource. In addition, if thetransmitting UE receives the information on the PUCCH resource indexindicating/representing the frequency domain and/or the code domain ofthe PUCCH resource, the transmitting UE may know/determine the frequencydomain and/or the code domain related to the PUCCH resource in thesymbol or the symbol duration related to the PUCCH resource. In thiscase, the PUCCH resource index indicating/representing the frequencydomain of the PUCCH resource may be, for example, a resource blockindex, and the PUCCH resource index indicating/representing the codedomain of the PUCCH resource may be, for example, an orthogonal codeindex or an orthogonal cover code index.

Alternatively, the base station may allocate a specific frequency domainas the PUCCH resource. In this case, if the transmitting UE receives theinformation on the time offset, the transmitting UE may know/determinethe symbol or the symbol duration related to the PUCCH resource. Inaddition, the transmitting UE may know/determine that the specificfrequency domain on the symbol or the symbol duration related to thePUCCH resource is allocated as the PUCCH resource. For example, thespecific frequency domain related to the PUCCH resource may bepredefined for the UE. For example, the UE may determine the specificfrequency domain related to the PUCCH resource by using a pre-defined(implicit) rule.

FIG. 14 shows an example of PUCCH resource allocation based on a symbolunit offset, based on an embodiment of the present disclosure. Theembodiment of FIG. 14 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 14, it is assumed that the reference timing point isthe last symbol of the PSSCH resource, and it is assumed that a symbolrelated to the PUCCH resource is the start symbol of the PUCCH resource.In this case, the transmitting UE may receive the time offset from thebase station, and may know/determine the symbol or the symbol durationrelated to the PUCCH resource of the transmitting UE. Additionally, thetransmitting UE may receive information on the PUCCH resource indexindicating/representing the frequency domain and/or the code domain ofthe PUCCH resource, and the transmitting UE may know/determine thefrequency domain and/or code domain related to the PUCCH resource in thesymbol or the symbol duration related to the PUCCH resource. In thiscase, the PUCCH resource index indicating/representing the frequencydomain of the PUCCH resource may be, for example, a resource blockindex, and the PUCCH resource index indicating/representing the codedomain of the PUCCH resource may be, for example, an orthogonal codeindex or an orthogonal cover code index.

3.2) PUCCH resource allocation based on slot unit offset

Based on an embodiment of the present disclosure, the information on thePUCCH resource may include information on a time offset (or slot offset)from the reference timing point to a slot related to the PUCCH resourceand information on a PUCCH resource index (based on a frequency domain,a symbol domain, and/or a code domain) on the slot related to the PUCCHresource. For example, the reference timing point may be at least one ofthe slot including the start symbol of the resource in which the SL DCIis transmitted, the slot including the last symbol of the resource inwhich the SL DCI is transmitted, the slot including the start symbol ofthe PSSCH resource, the slot including the last symbol of the PSSCHresource, the slot including the start symbol of the PSCCH resource, theslot including the last symbol of the PSCCH resource, the slot includingthe start symbol of the PSFCH resource, and/or the slot including thelast symbol of the PSFCH resource. For example, the slot related to thePUCCH resource may be at least one of the slot including the startsymbol of the PUCCH resource and/or the slot including the last symbolof the PUCCH resource. For example, the base station may signal theinformation on the time offset and the information on the PUCCH resourceindex to the transmitting UE through the SL DCI. Alternatively, forexample, the base station may configure the information on the timeoffset to the transmitting UE through the MAC CE and/or the RRCsignaling, and the base station may signal the information on the PUCCHresource index to the transmitting UE through the SL DCI. In this case,payloads of the SL DCI may be reduced. If the transmitting UE receivesthe information on the time offset, the transmitting UE mayknow/determine the slot related to the PUCCH resource. In addition, ifthe transmitting UE receives the information on the PUCCH resource indexindicating/representing the frequency domain, the symbol domain, and/orthe code domain of the PUCCH resource, the transmitting UE mayknow/determine the frequency domain, the symbol domain, and/or the codedomain related to the PUCCH resource within the slot related to thePUCCH resource. For example, the symbol domain may include the startsymbol and/or the symbol duration of the PUCCH resource, and the symboldomain may be signaled through an (additional) field defined in the SLDCI. In this case, the PUCCH resource index indicating/representing thefrequency domain of the PUCCH resource may be, for example, a resourceblock index, and the PUCCH resource index indicating/representing thecode domain of the PUCCH resource may be, for example, an orthogonalcode index or an orthogonal cover code index.

Alternatively, the base station may allocate a specific symbol domainand/or a specific frequency domain as the PUCCH resource. In this case,if the transmitting UE receives the information on the time offset, thetransmitting UE may know/determine the slot related to the PUCCHresource. In addition, the transmitting UE may know/determine that thespecific symbol domain and/or the specific frequency domain on thespecific symbol duration within the slot related to the PUCCH resourceis allocated as the PUCCH resource. For example, the specific frequencydomain and/or the specific symbol domain related to the PUCCH resourcemay be predefined for the UE. For example, the UE may determine thespecific frequency domain and/or the specific symbol domain related tothe PUCCH resource by using a predefined (implicit) rule.

FIG. 15 shows an example of PUCCH resource allocation based on a slotunit offset, based on an embodiment of the present disclosure. Theembodiment of FIG. 15 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 15, it is assumed that the reference timing point is aslot including the last symbol of the PSSCH resource, and it is assumedthat the slot related to the PUCCH resource is a slot including thestart symbol of the PUCCH resource or a slot including the last symbolof the PUCCH resource. In this case, the transmitting UE may receive thetime offset from the base station and may know/determine the slotrelated to the PUCCH resource of the transmitting UE. Additionally, thetransmitting UE may receive the information on the PUCCH resource indexindicating/representing the frequency domain, the symbol domain, and/orthe code domain of the PUCCH resource, and the transmitting UE mayknow/determine the frequency domain, the symbol domain, and/or the codedomain related to the PUCCH resource within the slot related to thePUCCH resource. In this case, the PUCCH resource indexindicating/representing the frequency domain of the PUCCH resource maybe, for example, a resource block index, and the PUCCH resource indexindicating/representing the code domain of the PUCCH resource may be,for example, an orthogonal code index or an orthogonal cover code index.

Additionally, based on an embodiment of the present disclosure,information on the PUCCH resource indicated by the SL DCI may beindependently signaled between initial transmission and retransmissionthrough different fields. For example, in the embodiment of FIG. 13, inthe case of the PUCCH resource allocation, a time offset related toinitial transmission and a time offset related to retransmission may beindependently signaled. Accordingly, the degree of freedom of the PUCCHresource allocation by the base station can be improved. Alternatively,information on the PUCCH resource indicated by the SL DCI may becommonly signaled between initial transmission and retransmissionthrough one field. For example, in the embodiment of FIG. 13, in thecase of the PUCCH resource allocation, a time offset related to initialtransmission and a time offset related to retransmission may be commonlysignaled. Accordingly, it is possible to prevent an increase in payloadsof the SL DCI.

Referring back to FIG. 12, in step S1220, the transmitting UE maytransmit sidelink information to the receiving UE through one or morePSCCHs and/or one or more PSSCHs.

In step S1230, the transmitting UE may receive SL HARQ feedback for thesidelink information from the receiving UE on the PSFCH resourcedetermined by the various methods proposed in the present disclosure.

In step S1240, the transmitting UE may report information on SL HARQfeedback to the base station on the PUCCH resource determined by thevarious methods proposed in the present disclosure.

FIG. 16 shows a procedure for a transmitting UE to report information onSL HARQ feedback to a base station, based on an embodiment of thepresent disclosure. The embodiment of FIG. 16 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 16, in step S1610, the transmitting UE may transmit UEassistance information to a base station. The UE assistance informationmay be information used by the base station to allocate (periodic)resources related to sidelink transmission to the transmitting UE. Forexample, the UE assistance information may include a period of trafficgenerated by the transmitting UE and/or the size of traffic generated bythe transmitting UE.

In step S1620, the base station may transmit information on resourcesrelated to sidelink transmission to the transmitting UE. For example,the base station may allocate resources related to sidelink transmissionto the transmitting UE. For example, the base station may allocateresources related to sidelink transmission to the transmitting UE basedon the UE assistance information.

For example, the resources related to the sidelink transmission mayinclude at least one of a sidelink transmission resource, a resourcerelated to transmission/reception of SL HARQ feedback, and/or a SL HARQfeedback report resource. For example, the sidelink transmissionresource may be one or more PSSCH resources and/or one or more PSCCHresources, the resource related to transmission/reception of SL HARQfeedback may be a PSFCH resource, and the SL HARQ feedback reportresource may be a PUCCH resource.

Based on an embodiment of the present disclosure, the base station maysignal resource(s) related to sidelink transmission to the transmittingUE through a SL semi-persistent scheduling (SPS) DCI, and/or the basestation may configure resource(s) related to sidelink transmission tothe transmitting UE through RRC signaling or a MAC CE. For example, theSL SPS DCI may be a DCI for scheduling (periodic) sidelinktransmission-related resources. For example, the SL SPS DCI may be a DCIfor activating SL SPS resources or a DCI for releasing SL SPS resources.For example, the base station may (periodically) allocate an initialresource and/or retransmission resource(s) necessary for transmitting aplurality of packets based on the UE assistance information. Forexample, the base station may repeatedly allocate (periodic) resourcesfor sidelink communication to the UE by using the SL SPS DCI. Forexample, the base station may repeatedly allocate (periodic) resourcesfor sidelink communication to the UE by using the SL SPS DCI, as in theembodiment of FIG. 13. For example, the base station may repeatedlyallocate (periodic) resources for sidelink communication to the UE byusing the SL SPS DCI, as in the embodiment of FIG. 17. In the presentdisclosure, the SPS may be replaced with a configured grant.

FIG. 17 shows an example of resource allocation based on an embodimentof the present disclosure. The embodiment of FIG. 17 may be combinedwith various embodiments of the present disclosure.

Referring to FIG. 17, the base station may allocate periodic resourcesfor SL communication and a resource for UL communication to thetransmitting UE. For example, the periodic resources may be configuredto the UE through an RRC message, and may be activated or deactivatedthrough a DCI. For example, the periodic resources may be allocated tothe UE through a DCI.

For example, the PUCCH resource may be allocated to the UE after a timeoffset from the last PSFCH resource in a period. For example, the PUCCHresource may be allocated to the UE after a time offset from a PSFCHresource related to the last PSSCH resource among a plurality of PSSCHresources within a period. For example, if a slot offset between thePSFCH resource and the PUCCH resource is K slots, and the PSFCH resourcerelated to the last PSSCH resource in the period is in the M-th slot,the PUCCH resource for reporting SL HARQ feedback may be allocated inthe (M+K)-th slot. In this case, the UE may report one SL HARQ feedbackto the base station by using the PUCCH resource in the (M+K)-th slot.That is, if the UE receives a plurality of SL HARQ feedbacks in responseto a plurality of PSSCHs transmitted within a period, the UE maygenerate one HARQ feedback based on the plurality of SL HARQ feedbacks,and the UE may transmit one HARQ feedback to the base station based onthe PUCCH resource (e.g., a PUCCH resource located after a time offsetfrom a PSFCH resource related to the last PSSCH resource within aperiod). Methods for the allocation of PSCCH resources, the allocationof PSSCH resources, the allocation of PUCCH resources and the allocationof PSFCH resources have already been described in detail with referenceto FIGS. 12 to 15, and thus will be omitted. Methods for the allocationof PSCCH resources, the allocation of PSSCH resources, the allocation ofPUCCH resources and the allocation of PSFCH resources may also beapplied to the embodiment of FIG. 16.

In step S1630, the transmitting UE may transmit sidelink information toa receiving UE through one or more PSCCHs and/or one or more PSSCHs.

In step S1640, the transmitting UE may receive SL HARQ feedback for thesidelink information from the receiving UE on a PSFCH resourcedetermined by the various methods proposed in the present disclosure.

In step S1650, the transmitting UE may report information on SL HARQfeedback to the base station on a PUCCH resource determined by thevarious methods proposed in the present disclosure.

Additionally, until the base station releases resources related tosidelink transmission, the transmitting UE may repeatedly performoperations S1630 to S1650. For example, the transmitting UE mayrepeatedly perform operations S1630 to S1650 until the base stationreleases resources related to sidelink transmission through the SL SPSDCI. For example, in step S1660, the transmitting UE may transmitsidelink information to the receiving UE through one or more PSCCHsand/or one or more PSSCHs. In step S1670, the transmitting UE mayreceive SL HARQ feedback for the sidelink information from the receivingUE on a PSFCH resource determined by the various methods proposed in thepresent disclosure. In step S1680, the transmitting UE may reportinformation on SL HARQ feedback to the base station on a PUCCH resourcedetermined by the various methods proposed in the present disclosure.

Based on an embodiment of the present disclosure, the base station canefficiently allocate PUCCH resource(s) for reporting information on SLHARQ feedback to the base station.

FIG. 18 shows a method for a first device to report information on SLHARQ feedback to a second device, based on an embodiment of the presentdisclosure. The embodiment of FIG. 18 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 18, in step S1810, the first device may receiveinformation on resource(s) related to sidelink transmission from thesecond device. For example, information on resource(s) related tosidelink transmission may include at least one of information on PSSCHresource(s), information on PSCCH resource(s), information on PFSCHresource(s), and/or information on PUCCH resource(s). For example, thesecond device may be a base station.

In step S1820, the first device may transmit sidelink information to athird device. For example, the third device may be at least one ofdevices 100, 200, 100 a, 100 b, 100 c, 100 d, 100 e, 100 f describedwith reference to FIG. 22 and/or FIGS. 23 to 27.

In step S1830, the first device may receive SL HARQ feedback for thesidelink information from the third device.

In step S1840, the first device may transmit information on SL HARQfeedback to the second device. For example, the first device maytransmit information on SL HARQ feedback to the second device by using aPUCCH resource determined based on various embodiments proposed in thepresent disclosure.

FIG. 19 shows a method for a second device to receive information on SLHARQ feedback from a first device, based on an embodiment of the presentdisclosure. The embodiment of FIG. 19 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 19, in step S1910, the second device may transmitinformation on resource(s) related to sidelink transmission to the firstdevice. For example, information on resource(s) related to sidelinktransmission may include at least one of information on PSSCHresource(s), information on PSCCH resource(s), information on PFSCHresource(s), and/or information on PUCCH resource(s).

In step S1920, the second device may receive information on SL HARQfeedback from the first device. For example, the second device mayreceive information on SL HARQ feedback from the first device on a PUCCHresource determined by various embodiments proposed in the presentdisclosure.

FIG. 20 shows a method for a first device to perform wirelesscommunication, based on an embodiment of the present disclosure. Theembodiment of FIG. 20 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 20, in step S2010, the first device may receive, froma base station through a physical downlink control channel (PDCCH), adownlink control information (DCI) for scheduling sidelink (SL)resources. Herein, the DCI may include information related to a timebetween a physical sidelink feedback channel (PSFCH) resource and aphysical uplink control channel (PUCCH) resource and information relatedto the PUCCH resource. In step S2020, the first device may transmit, toa second device, a plurality of physical sidelink control channels(PSCCHs) and a plurality of physical sidelink shared channels (PSSCHs),based on the DCI. In step S2030, the first device may determine aplurality of PSFCH resources, based on indices of slots related to theplurality of PSSCHs, indices of subchannels related to the plurality ofPSSCHs, and a source ID of the first device. In step S2040, the firstdevice may receive, from the second device, a plurality of SL hybridautomatic repeat request (HARQ) feedbacks related to the plurality ofPSSCHs on the plurality of PSFCH resources. In step S2050, the firstdevice may transmit, to the base station, one SL HARQ feedback on onePUCCH resource, based on the information related to the time and theinformation related to the PUCCH resource. For example, the one PUCCHresource may be allocated after a last PSFCH resource among theplurality of PSFCH resources.

For example, the plurality of PSCCHs and the plurality of PSSCHs may betransmitted within a time period. For example, the last PSFCH resourcemay be a PSFCH resource related to a resource for a last PSSCH amongresources for the plurality of PSSCHs within the time period. Forexample, the one PUCCH resource may be in a slot after the time from thelast PSFCH resource.

For example, the SL resources may be allocated periodically for thefirst device. For example, the DCI may include information foractivation of the SL resources.

For example, the information related to the time may be informationrelated to a number of slots between the one PUCCH resource and the lastPSFCH resource among the plurality of PSFCH resources. Additionally, forexample, the first device may determine a slot including the one PUCCHresource, based on the information related to the time, and the firstdevice may determine at least one of a frequency domain, a symboldomain, or a code domain of the one PUCCH resource in the slot, based onthe information related to the PUCCH resource.

For example, the information related to the time may be informationrelated to a number of symbols between the one PUCCH resource and thelast PSFCH resource among the plurality of PSFCH resources.Additionally, for example, the first device may determine a symbolincluding the one PUCCH resource, based on the information related tothe time, and the first device may determine at least one of a frequencydomain or a code domain of the one PUCCH resource in the symbol, basedon the information related to the PUCCH resource.

Additionally, for example, the first device may generate the one SL HARQfeedback based on the plurality of SL HARQ feedbacks. For example, thegenerated one SL HARQ feedback may be ACK based on the plurality of SLHARQ feedbacks including NACK and ACK. For example, the generated one SLHARQ feedback may be NACK based on the plurality of SL HARQ feedbacksincluding only NACK.

The proposed method can be applied to device(s) described below. First,the processor (102) of the first device (100) may control thetransceiver (106) to receive, from a base station through a physicaldownlink control channel (PDCCH), a downlink control information (DCI)for scheduling sidelink (SL) resources. Herein, the DCI may includeinformation related to a time between a physical sidelink feedbackchannel (PSFCH) resource and a physical uplink control channel (PUCCH)resource and information related to the PUCCH resource. In addition, theprocessor (102) of the first device (100) may control the transceiver(106) to transmit, to a second device, a plurality of physical sidelinkcontrol channels (PSCCHs) and a plurality of physical sidelink sharedchannels (PSSCHs), based on the DCI. In addition, the processor (102) ofthe first device (100) may determine a plurality of PSFCH resources,based on indices of slots related to the plurality of PSSCHs, indices ofsubchannels related to the plurality of PSSCHs, and a source ID of thefirst device. In addition, the processor (102) of the first device (100)may control the transceiver (106) to receive, from the second device, aplurality of SL hybrid automatic repeat request (HARQ) feedbacks relatedto the plurality of PSSCHs on the plurality of PSFCH resources. Inaddition, the processor (102) of the first device (100) may control thetransceiver (106) to transmit, to the base station, one SL HARQ feedbackon one PUCCH resource, based on the information related to the time andthe information related to the PUCCH resource. For example, the onePUCCH resource may be allocated after a last PSFCH resource among theplurality of PSFCH resources.

Based on an embodiment of the present disclosure, a first deviceconfigured to perform wireless communication may be provided. Forexample, the first device may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:receive, from a base station through a physical downlink control channel(PDCCH), a downlink control information (DCI) for scheduling sidelink(SL) resources, wherein the DCI includes information related to a timebetween a physical sidelink feedback channel (PSFCH) resource and aphysical uplink control channel (PUCCH) resource and information relatedto the PUCCH resource; transmit, to a second device, a plurality ofphysical sidelink control channels (PSCCHs) and a plurality of physicalsidelink shared channels (PSSCHs), based on the DCI; determining aplurality of PSFCH resources, based on indices of slots related to theplurality of PSSCHs, indices of subchannels related to the plurality ofPSSCHs, and a source ID of the first device; receive, from the seconddevice, a plurality of SL hybrid automatic repeat request (HARQ)feedbacks related to the plurality of PSSCHs on the plurality of PSFCHresources; and transmit, to the base station, one SL HARQ feedback onone PUCCH resource, based on the information related to the time and theinformation related to the PUCCH resource. For example, the one PUCCHresource may be allocated after a last PSFCH resource among theplurality of PSFCH resources.

Based on an embodiment of the present disclosure, an apparatusconfigured to control a first user equipment (UE) may be provided. Forexample, the apparatus may comprise: one or more processors; and one ormore memories operably connected to the one or more processors andstoring instructions. For example, the one or more processors mayexecute the instructions to: receive, from a base station through aphysical downlink control channel (PDCCH), a downlink controlinformation (DCI) for scheduling sidelink (SL) resources, wherein theDCI includes information related to a time between a physical sidelinkfeedback channel (PSFCH) resource and a physical uplink control channel(PUCCH) resource and information related to the PUCCH resource;transmit, to a second UE, a plurality of physical sidelink controlchannels (PSCCHs) and a plurality of physical sidelink shared channels(PSSCHs), based on the DCI; determining a plurality of PSFCH resources,based on indices of slots related to the plurality of PSSCHs, indices ofsubchannels related to the plurality of PSSCHs, and a source ID of thefirst UE; receive, from the second UE, a plurality of SL hybridautomatic repeat request (HARQ) feedbacks related to the plurality ofPSSCHs on the plurality of PSFCH resources; and transmit, to the basestation, one SL HARQ feedback on one PUCCH resource, based on theinformation related to the time and the information related to the PUCCHresource. For example, the one PUCCH resource may be allocated after alast PSFCH resource among the plurality of PSFCH resources.

Based on an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, may cause a first deviceto: receive, from a base station through a physical downlink controlchannel (PDCCH), a downlink control information (DCI) for schedulingsidelink (SL) resources, wherein the DCI includes information related toa time between a physical sidelink feedback channel (PSFCH) resource anda physical uplink control channel (PUCCH) resource and informationrelated to the PUCCH resource; transmit, to a second device, a pluralityof physical sidelink control channels (PSCCHs) and a plurality ofphysical sidelink shared channels (PSSCHs), based on the DCI;determining a plurality of PSFCH resources, based on indices of slotsrelated to the plurality of PSSCHs, indices of subchannels related tothe plurality of PSSCHs, and a source ID of the first device; receive,from the second device, a plurality of SL hybrid automatic repeatrequest (HARQ) feedbacks related to the plurality of PSSCHs on theplurality of PSFCH resources; and transmit, to the base station, one SLHARQ feedback on one PUCCH resource, based on the information related tothe time and the information related to the PUCCH resource. For example,the one PUCCH resource may be allocated after a last PSFCH resourceamong the plurality of PSFCH resources.

FIG. 21 shows a method for a base station to perform wirelesscommunication, based on an embodiment of the present disclosure. Theembodiment of FIG. 21 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 21, in step S2110, the base station may transmit, to afirst device through a physical downlink control channel (PDCCH), adownlink control information (DCI) for scheduling sidelink (SL)resources. Herein, the DCI may include information related to a timebetween a physical sidelink feedback channel (PSFCH) resource and aphysical uplink control channel (PUCCH) resource and information relatedto the PUCCH resource. In step S2120, the base station may receive, fromthe first device, one SL hybrid automatic repeat request (HARQ) feedbackon one PUCCH resource, based on the information related to the PUCCHresource and the information related to the time. For example, the onePUCCH resource may be allocated after a last PSFCH resource among aplurality of PSFCH resources.

The proposed method can be applied to device(s) described below. First,the processor (202) of the base station (200) may control thetransceiver (206) to transmit, to a first device through a physicaldownlink control channel (PDCCH), a downlink control information (DCI)for scheduling sidelink (SL) resources. Herein, the DCI may includeinformation related to a time between a physical sidelink feedbackchannel (PSFCH) resource and a physical uplink control channel (PUCCH)resource and information related to the PUCCH resource. In addition, theprocessor (202) of the base station (200) may control the transceiver(206) to receive, from the first device, one SL hybrid automatic repeatrequest (HARQ) feedback on one PUCCH resource, based on the informationrelated to the PUCCH resource and the information related to the time.For example, the one PUCCH resource may be allocated after a last PSFCHresource among a plurality of PSFCH resources.

Based on an embodiment of the present disclosure, a base stationconfigured to perform wireless communication may be provided. Forexample, the base station may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:transmit, to a first device through a physical downlink control channel(PDCCH), a downlink control information (DCI) for scheduling sidelink(SL) resources, wherein the DCI includes information related to a timebetween a physical sidelink feedback channel (PSFCH) resource and aphysical uplink control channel (PUCCH) resource and information relatedto the PUCCH resource; and receive, from the first device, one SL hybridautomatic repeat request (HARQ) feedback on one PUCCH resource, based onthe information related to the PUCCH resource and the informationrelated to the time. For example, the one PUCCH resource may beallocated after a last PSFCH resource among a plurality of PSFCHresources.

Based on an embodiment of the present disclosure, an apparatusconfigured to control a base station may be provided. For example, theapparatus may comprise: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions. For example, the one or more processors may execute theinstructions to: transmit, to a first user equipment (UE) through aphysical downlink control channel (PDCCH), a downlink controlinformation (DCI) for scheduling sidelink (SL) resources, wherein theDCI includes information related to a time between a physical sidelinkfeedback channel (PSFCH) resource and a physical uplink control channel(PUCCH) resource and information related to the PUCCH resource; andreceive, from the first UE, one SL hybrid automatic repeat request(HARQ) feedback on one PUCCH resource, based on the information relatedto the PUCCH resource and the information related to the time. Forexample, the one PUCCH resource may be allocated after a last PSFCHresource among a plurality of PSFCH resources.

Based on an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, may cause a base stationto: transmit, to a first device through a physical downlink controlchannel (PDCCH), a downlink control information (DCI) for schedulingsidelink (SL) resources, wherein the DCI includes information related toa time between a physical sidelink feedback channel (PSFCH) resource anda physical uplink control channel (PUCCH) resource and informationrelated to the PUCCH resource; and receive, from the first device, oneSL hybrid automatic repeat request (HARQ) feedback on one PUCCHresource, based on the information related to the PUCCH resource and theinformation related to the time. For example, the one PUCCH resource maybe allocated after a last PSFCH resource among a plurality of PSFCHresources.

Various embodiments of the present disclosure may be combined with eachother.

Hereinafter, device(s) to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 22 shows a communication system 1, based on an embodiment of thepresent disclosure.

Referring to FIG. 22, a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

Here, wireless communication technology implemented in wireless devices100 a to 100 f of the present disclosure may include Narrowband Internetof Things for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 a to100 f of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called by various names includingenhanced Machine Type Communication (eMTC), and the like. For example,the LTE-M technology may be implemented as at least any one of variousstandards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTEnon-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine TypeCommunication, and/or 7) LTE M, and is not limited to the name describedabove. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 a to 100 f of thepresent disclosure may include at least one of Bluetooth, Low Power WideArea Network (LPWAN), and ZigBee considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)related to small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be called byvarious names.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g., relay, IntegratedAccess Backhaul (IAB)). The wireless devices and the BSs/the wirelessdevices may transmit/receive radio signals to/from each other throughthe wireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 23 shows wireless devices, based on an embodiment of the presentdisclosure.

Referring to FIG. 23, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 22.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 24 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

Referring to FIG. 24, a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 24 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 23. Hardwareelements of FIG. 24 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 23. For example, blocks 1010to 1060 may be implemented by the processors 102 and 202 of FIG. 23.Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 23 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 23.

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 24. Herein, the codewords are encoded bit sequencesof information blocks. The information blocks may include transportblocks (e.g., a UL-SCH transport block, a DL-SCH transport block). Theradio signals may be transmitted through various physical channels(e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 24. For example, the wireless devices(e.g., 100 and 200 of FIG. 23) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 25 shows another example of a wireless device, based on anembodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 22).

Referring to FIG. 25, wireless devices 100 and 200 may correspond to thewireless devices 100 and 200 of FIG. 23 and may be configured by variouselements, components, units/portions, and/or modules. For example, eachof the wireless devices 100 and 200 may include a communication unit110, a control unit 120, a memory unit 130, and additional components140. The communication unit may include a communication circuit 112 andtransceiver(s) 114. For example, the communication circuit 112 mayinclude the one or more processors 102 and 202 and/or the one or morememories 104 and 204 of FIG. 23. For example, the transceiver(s) 114 mayinclude the one or more transceivers 106 and 206 and/or the one or moreantennas 108 and 208 of FIG. 23. The control unit 120 is electricallyconnected to the communication unit 110, the memory 130, and theadditional components 140 and controls overall operation of the wirelessdevices. For example, the control unit 120 may control anelectric/mechanical operation of the wireless device based onprograms/code/commands/information stored in the memory unit 130. Thecontrol unit 120 may transmit the information stored in the memory unit130 to the exterior (e.g., other communication devices) via thecommunication unit 110 through a wireless/wired interface or store, inthe memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 22), the vehicles (100 b-1 and 100 b-2 of FIG. 22), the XRdevice (100 c of FIG. 22), the hand-held device (100 d of FIG. 22), thehome appliance (100 e of FIG. 22), the IoT device (100 f of FIG. 22), adigital broadcast terminal, a hologram device, a public safety device,an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 22), the BSs (200 of FIG. 22), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 25, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 25 will be described indetail with reference to the drawings.

FIG. 26 shows a hand-held device, based on an embodiment of the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT).

Referring to FIG. 26, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c.The antenna unit 108 may be configured as a part of the communicationunit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110to 130/140 of FIG. 25, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 27 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure. The vehicle or autonomous vehicle may beimplemented by a mobile robot, a car, a train, a manned/unmanned AerialVehicle (AV), a ship, etc.

Referring to FIG. 27, a vehicle or autonomous vehicle 100 may include anantenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 25, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing wireless communication bya first device, the method comprising: receiving, from a base stationthrough a physical downlink control channel (PDCCH), a downlink controlinformation (DCI) for scheduling sidelink (SL) resources, wherein theDCI includes information related to a time between a physical sidelinkfeedback channel (PSFCH) resource and a physical uplink control channel(PUCCH) resource and information related to the PUCCH resource;transmitting, to a second device, a plurality of physical sidelinkcontrol channels (PSCCHs) and a plurality of physical sidelink sharedchannels (PSSCHs), based on the DCI; determining a plurality of PSFCHresources, based on indices of slots related to the plurality of PSSCHs,indices of subchannels related to the plurality of PSSCHs, and a sourceID of the first device; receiving, from the second device, a pluralityof SL hybrid automatic repeat request (HARQ) feedbacks related to theplurality of PSSCHs on the plurality of PSFCH resources; andtransmitting, to the base station, one SL HARQ feedback on one PUCCHresource, based on the information related to the time and theinformation related to the PUCCH resource, wherein the one PUCCHresource is allocated after a last PSFCH resource among the plurality ofPSFCH resources.
 2. The method of claim 1, wherein the plurality ofPSCCHs and the plurality of PSSCHs are transmitted within a time period.3. The method of claim 2, wherein the last PSFCH resource is a PSFCHresource related to a resource for a last PSSCH among resources for theplurality of PSSCHs within the time period.
 4. The method of claim 3,wherein the one PUCCH resource is in a slot after the time from the lastPSFCH resource.
 5. The method of claim 1, wherein the SL resources areallocated periodically for the first device.
 6. The method of claim 1,wherein the DCI includes information for activation of the SL resources.7. The method of claim 1, wherein the information related to the time isinformation related to a number of slots between the one PUCCH resourceand the last PSFCH resource among the plurality of PSFCH resources. 8.The method of claim 7, further comprising: determining a slot includingthe one PUCCH resource, based on the information related to the time;and determining at least one of a frequency domain, a symbol domain, ora code domain of the one PUCCH resource in the slot, based on theinformation related to the PUCCH resource.
 9. The method of claim 1,wherein the information related to the time is information related to anumber of symbols between the one PUCCH resource and the last PSFCHresource among the plurality of PSFCH resources.
 10. The method of claim9, further comprising: determining a symbol including the one PUCCHresource, based on the information related to the time; and determiningat least one of a frequency domain or a code domain of the one PUCCHresource in the symbol, based on the information related to the PUCCHresource.
 11. The method of claim 1, further comprising: generating theone SL HARQ feedback based on the plurality of SL HARQ feedbacks. 12.The method of claim 11, wherein the generated one SL HARQ feedback isACK based on the plurality of SL HARQ feedbacks including NACK and ACK,and wherein the generated one SL HARQ feedback is NACK based on theplurality of SL HARQ feedbacks including only NACK.
 13. The method ofclaim 1, further comprising: receiving, from the base station,information related to a frequency domain of the PUCCH resource, whereinthe PUCCH resource is included in the frequency domain.
 14. A firstdevice configured to perform wireless communication, the first devicecomprising: one or more memories storing instructions; one or moretransceivers; and one or more processors connected to the one or morememories and the one or more transceivers, wherein the one or moreprocessors execute the instructions to: receive, from a base stationthrough a physical downlink control channel (PDCCH), a downlink controlinformation (DCI) for scheduling sidelink (SL) resources, wherein theDCI includes information related to a time between a physical sidelinkfeedback channel (PSFCH) resource and a physical uplink control channel(PUCCH) resource and information related to the PUCCH resource;transmit, to a second device, a plurality of physical sidelink controlchannels (PSCCHs) and a plurality of physical sidelink shared channels(PSSCHs), based on the DCI; determining a plurality of PSFCH resources,based on indices of slots related to the plurality of PSSCHs, indices ofsubchannels related to the plurality of PSSCHs, and a source ID of thefirst device; receive, from the second device, a plurality of SL hybridautomatic repeat request (HARQ) feedbacks related to the plurality ofPSSCHs on the plurality of PSFCH resources; and transmit, to the basestation, one SL HARQ feedback on one PUCCH resource, based on theinformation related to the time and the information related to the PUCCHresource, wherein the one PUCCH resource is allocated after a last PSFCHresource among the plurality of PSFCH resources.
 15. The first device ofclaim 14, wherein the plurality of PSCCHs and the plurality of PSSCHsare transmitted within a time period.
 16. The first device of claim 15,wherein the last PSFCH resource is a PSFCH resource related to aresource for a last PSSCH among resources for the plurality of PSSCHswithin the time period.
 17. The first device of claim 16, wherein theone PUCCH resource is in a slot after the time from the last PSFCHresource.
 18. The first device of claim 14, wherein the SL resources areallocated periodically for the first device.
 19. The first device ofclaim 14, wherein the DCI includes information for activation of the SLresources.
 20. An apparatus configured to control a first user equipment(UE), the apparatus comprising: one or more processors; and one or morememories operably connected to the one or more processors and storinginstructions, wherein the one or more processors execute theinstructions to: receive, from a base station through a physicaldownlink control channel (PDCCH), a downlink control information (DCI)for scheduling sidelink (SL) resources, wherein the DCI includesinformation related to a time between a physical sidelink feedbackchannel (PSFCH) resource and a physical uplink control channel (PUCCH)resource and information related to the PUCCH resource; transmit, to asecond UE, a plurality of physical sidelink control channels (PSCCHs)and a plurality of physical sidelink shared channels (PSSCHs), based onthe DCI; determining a plurality of PSFCH resources, based on indices ofslots related to the plurality of PSSCHs, indices of subchannels relatedto the plurality of PSSCHs, and a source ID of the first UE; receive,from the second UE, a plurality of SL hybrid automatic repeat request(HARQ) feedbacks related to the plurality of PSSCHs on the plurality ofPSFCH resources; and transmit, to the base station, one SL HARQ feedbackon one PUCCH resource, based on the information related to the time andthe information related to the PUCCH resource, wherein the one PUCCHresource is allocated after a last PSFCH resource among the plurality ofPSFCH resources.